Process for the dyeing and printing of acetate artificial silk



Patented y it, 1940 i s'rA'rss PATENT OFFICE PROCESS FOR THE DYEING AND PRINTIN 0F ACETATE ARTIFICIAL SILK,

Heinrich Bitter, Frankiort-on-the-Main-Fechenheim, Germany, assignor to General & Film Corporation, a corporation of Delaware No Drawing. Application No.- 206,373. In Germany 6 Claims. (c1. a-s'z) The present application is in part a continuation of my application Serial No. 159,526, filed August 17, 1937, which relates to condensation products of the diphenylamine series.

My present invention relates to a process for the dyeing and printing of acetate artificial silk by employing as dyestuffs the condensation products of the diphenylamine series of the general formula:

wherein X stands for a member selected from the group consisting of hydrogen and hydroxy and alkoxy radicals.

The invention is illustrated, but not limited by the following examples, the parts being by weight and all temperatures in degrees centigrade.

Example 1 Acetate artificial silk is dyed at Gil-75 by means of an aqueous suspension of 2-nitro-4- cyanodiphenylamine of the formula:

with the addition of soapQwhereby the dye-bath is advantageously prepared with the addition of a suitable dispersing agent. Thus yellow dyeings of excellent fastness to light are obtained.

The 2-nitr o-4-cyanodiphenylamine may be prepared for example by condensing 1-chloro-2- nitro-4-cyanobenzene with aniline.

By employing 4'-methoxy-4-cyano 2-nitrodiphenylamine (prepared for example by condensing l-chloro-2 nitro-4-cyanobenzene with 4 methoiw-l-aminobenzene) likewise yrllow dyeings and prints on acetate artificial silk are ob tamed.

a dyestufi of the general formula:

May 6, 1938, Serial August 28, 1936 Example 2 When acetate artificial silk is dyed m' an analogous manner as described in Example 1 by means of a suspension of 4'-hydroxy-4-cyano-2-nitrodiphenylamine of the formula:.

orange-yellow dyeings of excellent iastness to light are obtained.-

The 4-hydroxy-4-cyano-2-nitrodiphenylamine may be prepared for example by condensing 1- chloro-2-nitro-4-cyanobenzene with d-aminophenol.

I claim:

l. Process for the dyeing and printing of acetate artificial silk which comprises contacting acetate artificial silk with a compound of the diphenylamine series of the general formula:

X standing for a member selected from the group consisting of hydrogen and hydroxy and alkoxy radicals, whereby bright greenish yellow to orange dyeings and prints of excellent'fastness to light are obtained.

2. Acetate artificial silk dyed or printed with wherein X stands for a member selected from the group consisting of hydrogen and alkoxy radicals.

3.'Process for the dyeing and prmtmg of acetate artificial silk which comprises contacting -acetate artificial silk with the dyestufi 2-nitro-4- cyanodiphenylamine of the formula:

ONHMQ'CN Q whereby yellow dyeings and prints of excellent fastness to light are obtained.

4. Acetate artificial silk dyed or printed with the 2-nitro-4-cyanodiphenylamine of the formuhydroxy .and'

5. Process for the dyeing and printing of ace- 6. Acetate artificial silk dyed or printed with tate artificial silk which comprises contacting the 4'-hydroxy-4-cyano-2-nitrodiphenylamine of acetate artificial silk with the dyestuif 4'-hythe formula: droxy-4-cyano-2-nltrodiphenylamine of the for- 5 mule: 5

10 whereby orange-yellow dyeings and prints of ex- HEINRICH RI'I'I'ER. 10

cellent fastness to light are obtained. 

